Truncate autobuild errors to 10 lines

lib/cli-errors.js

@@ -103,8 +103,13 @@ function extractFatalErrors(error) {
 }
 function extractAutobuildErrors(error) {
     const pattern = /.*\[autobuild\] \[ERROR\] (.*)/gi;
-    return ([...error.matchAll(pattern)].map((match) => match[1]).join("\n") ||
+    let errorLines = [...error.matchAll(pattern)].map((match) => match[1]);
-        undefined);
+    // Truncate if there are more than 10 matching lines.
+    if (errorLines.length > 10) {
+        errorLines = errorLines.slice(0, 10);
+        errorLines.push("(truncated)");
+    }
+    return errorLines.join("\n") || undefined;
 }
 function ensureEndsInPeriod(text) {
     return text[text.length - 1] === "." ? text : `${text}.`;

lib/codeql.test.js

@@ -629,6 +629,23 @@ for (const { codeqlVersion, flagPassed, githubVersion, negativeFlagPassed, } of
             "  and finished here.",
     });
 });
+(0, ava_1.default)("runTool truncates long autobuilder errors", async (t) => {
+    const stderr = Array.from({ length: 20 }, (_, i) => `[2019-09-18 12:00:00] [autobuild] [ERROR] line${i + 1}`).join("\n");
+    stubToolRunnerConstructor(1, stderr);
+    const codeqlObject = await codeql.getCodeQLForTesting();
+    sinon.stub(codeqlObject, "getVersion").resolves((0, testing_utils_1.makeVersionInfo)("2.12.4"));
+    sinon.stub(codeqlObject, "resolveExtractor").resolves("/path/to/extractor");
+    // safeWhich throws because of the test CodeQL object.
+    sinon.stub(safeWhich, "safeWhich").resolves("");
+    await t.throwsAsync(async () => await codeqlObject.runAutobuild(languages_1.Language.java, false), {
+        instanceOf: cli_errors_1.CommandInvocationError,
+        message: "We were unable to automatically build your code. Please provide manual build steps. " +
+            "For more information, see " +
+            "https://docs.github.com/en/code-security/code-scanning/troubleshooting-code-scanning/automatic-build-failed. " +
+            "Encountered the following error: " +
+            `${Array.from({ length: 10 }, (_, i) => `line${i + 1}`).join("\n")}\n(truncated)`,
+    });
+});
 (0, ava_1.default)("runTool outputs last line of stderr if fatal error could not be found", async (t) => {
     const cliStderr = "line1\nline2\nline3\nline4\nline5";
     stubToolRunnerConstructor(32, cliStderr);

src/cli-errors.ts

@@ -109,10 +109,13 @@ function extractFatalErrors(error: string): string | undefined {
 
 function extractAutobuildErrors(error: string): string | undefined {
   const pattern = /.*\[autobuild\] \[ERROR\] (.*)/gi;
-  return (
+  let errorLines = [...error.matchAll(pattern)].map((match) => match[1]);
-    [...error.matchAll(pattern)].map((match) => match[1]).join("\n") ||
+  // Truncate if there are more than 10 matching lines.
-    undefined
+  if (errorLines.length > 10) {
-  );
+    errorLines = errorLines.slice(0, 10);
+    errorLines.push("(truncated)");
+  }
+  return errorLines.join("\n") || undefined;
 }
 
 function ensureEndsInPeriod(text: string): string {

src/codeql.test.ts

@@ -1002,6 +1002,34 @@ test("runTool summarizes autobuilder errors", async (t) => {
   );
 });
 
+test("runTool truncates long autobuilder errors", async (t) => {
+  const stderr = Array.from(
+    { length: 20 },
+    (_, i) => `[2019-09-18 12:00:00] [autobuild] [ERROR] line${i + 1}`,
+  ).join("\n");
+  stubToolRunnerConstructor(1, stderr);
+  const codeqlObject = await codeql.getCodeQLForTesting();
+  sinon.stub(codeqlObject, "getVersion").resolves(makeVersionInfo("2.12.4"));
+  sinon.stub(codeqlObject, "resolveExtractor").resolves("/path/to/extractor");
+  // safeWhich throws because of the test CodeQL object.
+  sinon.stub(safeWhich, "safeWhich").resolves("");
+
+  await t.throwsAsync(
+    async () => await codeqlObject.runAutobuild(Language.java, false),
+    {
+      instanceOf: CommandInvocationError,
+      message:
+        "We were unable to automatically build your code. Please provide manual build steps. " +
+        "For more information, see " +
+        "https://docs.github.com/en/code-security/code-scanning/troubleshooting-code-scanning/automatic-build-failed. " +
+        "Encountered the following error: " +
+        `${Array.from({ length: 10 }, (_, i) => `line${i + 1}`).join(
+          "\n",
+        )}\n(truncated)`,
+    },
+  );
+});
+
 test("runTool outputs last line of stderr if fatal error could not be found", async (t) => {
   const cliStderr = "line1\nline2\nline3\nline4\nline5";
   stubToolRunnerConstructor(32, cliStderr);